Trammel



' Feb. 1.5,'1927. v 1,617,662

c. AKRoYD TRAMMEL Filed Ap'ril 2o, 192e I nven'tor A Attorney Patented Feb. 15, 1927.

Unirse STATES raisur erstes.

CHARLES ACKROYD, OF LOS ANGELES, CALIFORNIA. v

TRAMMEL.

Application filed April 20, 1926. Serial No. 103,298.

.My present invention has to do with in! the drawings, accompanying' and formingY part ofthis specification7 in which Figure 1 is a broken side elevation ofthe trammel constituting the best practical embodiment of my invention of which I am,

cognizant.

Figure 2 is a detail longitudinal sectiontaken inthe plane indicated by the line 2-2 of Figure 3.

Figure 3 is a transverse section withparts j in elevation.

Figure 4 is a detail perspective of the spring shoe comprised in the device.

Similar numerals of reference designate corresponding parts in all lof the views of the drawings.

Among other elements my novel device comprises a body bar 1, of steel or other appropriate material. The said body 1 is provided upon one of its edges with fine ,teeth 2 and is provided on its face with a graduated scale 8.

In addition to the body bar 1 the trammel .includes a point 4 designed to be adjustably fixed with respect to the bar 1, and a point 5 that is equipped for quick and easy adjustment on the bar 1 in the direction of the length thereof and is also adapted to remain iin the position in which it is placed as hereinafter described.

The point 4 is provided with an enlargement 6 that straddles and is slidable upon Y the body bar 1, Vand in the bight portion of the enlargement 6 is arranged a shoe 7 with upturned ends, the said shoe being designed to be pressed against one edge of the body bar 1 through the medium Vof a' screw 8 threadedthrough thewalll at the to Yor heel end of the enlargement 6. Mani estly by tightening the screw' 8the point 4 may be adjustably fixed to the bar 1, and after the screw 8 is loosened to lessen the frictional Contact between the shoe 7 and the bar .1, the pointer 4 may berreadily adjusted on the bar 1 in the direction of the length thereof. It will alsobe understood that the enlargement 6 snugly receives the bar 1 and therefore the point 4 is held against movement with respeotto the bar l, other than the longitudinal movement alluded'to.

The point 5 is provided at its upper end v with an enlargementv 9 that straddlesfthe body bar 1 from below and is provided in one of its walls withan aperturelO, preferably of Vshape asillustrated. The said enlargement 10 carries a pointer 11 arranged in the vertex of the aperture 10, andv arranged within the enlargement 9 and against. the lower edge of` the body barl is a spring-I shoe 12 which is normally in the state shown in Figure 4, andv hence when interposed between the lower `portion of the enlargement 9 and the body bar 1 `is adapted to exert yielding pressureA against the lower edge of the body'bar 1. The saidresilient shoe 12 is provided at its middle with a pendent `loop lthatis disposed in a pocket 14 in the enlargement 9, as shown Yin Figure 2.

Surmountmg the enlargement 9 and connected thereto through the `medium of Y' screws 15 is a crown block16, and in confronting portions of the enlargement 9and the crown block 16 are bearings 17 for a shaft 18, the said shaft 18 being equipped with a spur gear 19 in mesh with the teeth 2 and having at one end a knurled finger wheel 2O and at its opposite end a threaded portion to receive a binding wheel 21 with a washer or washers` betweenit and the adjacent side of the enlargement 9 andV crown block 16 whereby when the wheel 21 is tightened the point 5 will be adjustably iixed with respect to the body bar 1 while when the wheel 2 1 is loosened, the shaft 18 maybe turned through the hand wheel. 2O for the movement of the point 5 on the bodybar 1 in the direction of the length thereof. v

It will be apparent from the `forego-ing that in addition tov constituting. an efficient and otherwise advantageous trammel, `my novel device may be used to advantageas Va scale and as a'straight edge. Y

I have entered into a detailed description of the construction, comprisedV in the device f constituting the best` practical embodiment of my invention in order to imparta full, clear and exact understanding of the said embodiment. I do not desire, however, to be understood as limiting myself to the precise construction and arrangement disclosed,

his:-

inyinven'tion'being defined appended Y claims Within the scope of which modiea- "tions may be made Without departure from my invention'.

Having described my invention, what I claim and desire to secure by Letters Patent,

l. In combination7 a body bar having a toothed e'dfge fand also VVhaving graduated sea-leen lfafee, aponitielspe'sed `at an angle to the body'baifafn'd having` Ian enlargement projecting nto said lli-'shaped `opening at the vertex thereof, afcrownlblogk con- `nected to said enlargement, a spring shoe interposed betveen the said enlargement and one edge of the body bar, anda shaft journaled between the said enlargement and Vthe said crown block and having a toothed portion in mesh with the teeth of the Ybar and alsohaving ya linger vpiece for the ready Y turning thereor'f; the said enlargement `haveA ing a ipeeket, and the Said shoe han'fiyrigraiV pendent loop-shaped portion fat- 4an inten mediate peint in its length and disposed in said ipeeket. n Y Y I 3. In fconibination, a body bar having a toothed edgeand also hav-ing agraduated scale von one ofits sides, spring shoe bearaga'inst the opposite edge of thejfbar, a point hav-ing a portion straddlirrg y the 'spring shoe-arid rthe baar land :apertured to hold the spr-ing*shore7 pointer means also Carried by said pointandfadapted for eooperation` With. the gradated seale,l-a n'ger o'p'eratedishaft carried byf'the point and having a toothed 'Wheel ilnln'esh Wit-h the Vteeth of the barand a second point receiving adjustable on the bar in' the direction Yof 'the length thereof-and'eqipped for ladjlisl'fab'le fixture to the ar n Y In testime'nywhereo-f IfafliX anysignataire.V

'v CHARLES ACKROYD. 

